GMC Jimmy 2004 Owner's Manual page 341

(A) Tire Size: The tire size code is a combination of
letters and numbers used to define a particular
tire's width, height, aspect ratio, construction type and
service description. See the "Tire Size" illustration
later in this section for more detail.
(B) Tire Performance Criteria Specification
(TPC Spec): Original equipment tires designed to
GM's specific tire performance criteria have a
TPC specification code molded onto the sidewall.
GM's TPC specifications meet or exceed all federal
safety guidelines.
(C) Dual Tire Maximum Load: Maximum load that can
be carried and the maximum pressure needed to
support that load when used in a dual configuration.
For information on recommended tire pressure see
Inflation - Tire Pressure on page 5-68 and Loading Your
Vehicle on page 4-54.
(D) Department of Transportation (DOT): The
Department of Transportation (DOT) code indicates that
the tire is in compliance with the U.S. Department of
Transportation Motor Vehicle Safety Standards.
(E) Tire Identification Number (TIN): The letters and
numbers following DOT code are the Tire Identification
Number (TIN). The TIN shows the manufacturer
and plant code, tire size, and date the tire was
manufactured. The TIN is molded onto both sides of
the tire, although only one side may have the date
of manufacture.
(F) Tire Ply Material: The type of cord and number
of plies in the sidewall and under the tread.
(G) Single Tire Maximum Load: Maximum load
that can be carried and the maximum pressure
needed to support that load when used as a single.
For information on recommended tire pressure
see Inflation - Tire Pressure on page 5-68 and
Loading Your Vehicle on page 4-54.
5-61